2014 Rinnai Tankless Models & Innovations • RUC98i and RUC80i: Highlighted in late 2014 announcements by Supply House Times and ACHR News, these Ultra Series condensing units added built-in adaptability for either concentric or 3”/4” twin-pipe PVC/CPVC venting configurations out of the same box. • Ultra Series Expansion: Rinnai also expanded its high-efficiency condensing offerings through late 2014 with the rollout of additional RU-series and RUR-series units designed to maximize installation flexibility and energy factor ratings